The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 1997
Filed:
Sep. 01, 1994
Applicant:
Inventors:
Tomonori Niwa, Nagoya, JP;
Tetsuji Yogo, Nagoya, JP;
Assignee:
NGK Spark Plug Co., Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A47B / ; B60B / ;
U.S. Cl.
CPC ...
16 45 ; 384492 ;
Abstract
A bearing type wheel for a car which rollers through a car tunnel kiln, includes a plurality of rotating members such as rollers or balls interposed between respective inner rings and an outer ring. Each of the rotating members consists essentially of a sintered body of silicon nitride base (Si.sub.3 N.sub.4) ceramic.